Lennox Hearth 32FS operation manual TROUBLESHOOTING Qualified Technicians Only

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TROUBLESHOOTING

Qualified Technicians Only

Unplug Appliance Before Performing Any Troubleshooting or Maintenance

PROBLEM	CAUSE(S)	SOLUTIONS
1. Fire burns with a lazy orange flame. Pellets build up	A)	A1) Lack of maintenance (clean UltraGrate™, clean-out ports,
in the and there is excessive glass soot that is difficult to	• There is insufficient combustion air.	exhaust flow passages, venting system, combustion blower
remove (Ash and soot are a product of combustion with	• Fuel feed rate is too high.	intake, etc.
any wood products, so some build-up on the glass is		• Remove any clinkers or ash from the bottom of the UltraGrate
normal).			that might be obstructing the primary air holes.
		• Check that the heat exchange tubes are not coated with
			ash.
		• Clean internal exhaust ducts.
		• Check gasket seal around the door. Use a thin strip of paper,
			1 in. wide. Open the door and close it on the paper strip. A
			slight friction should be felt when the paper strip is pulled.
			Repeat this process at various locations around the door
			gasket. Replace the door gasket if necessary.
		• Check for blockage in the air inlet tube or exhaust pipe. Clean
			as Necessary.
		• Inspect glass seal to ensure that it is in good condition and
			is properly seated to the door.
		A2) Fuel trim may need to be adjusted down for faster feeding
		fuels.
		A3) Change to a better grade of fuel if necessary. Check that
		the damper has been opened enough for the amount of fuel
		fed.
		A4) Have your Lennox Hearth Products dealer check your
		combustion blower for proper operation.
		A5) The venting system design is too restrictive (call your
		Lennox Hearth Products Technician to evaluate how the
		installation can be corrected to satisfy the exhaust flow
		requirements of the appliance).
		A6) Adjust the damper to increase combustion air flow.
2. Fire goes out or stove shuts down automatically	A) Stove has run out of fuel.	A) Refill hopper.
	B) Pellets are not feeding.	B) See (Pellets will not feed) this Page.
	C) The high limit temperature switch has	C) Allow the appliance to cool for 1 hour, then re-light. If the stove
	tripped.	has been operating at a medium to high burn rate with the room air
	D) There is too much combustion air for	blower adjusted to low, there may not be enough air flow to dissipate
		the heat. On higher feed rates, adjust the blower speed to a higher
	the amount of fuel.
		setting. If this problem persists (particularly at lower burn rates) then
	E) The proof of fire switch is opening,
		the high limit thermal switch may need to be replaced by your dealer.
	disconnecting power to the auger	D) Adjust the damper to reduce combustion air flow.
	motor.
		E) Clean proof of fire switch (see maintenance section). If this does
		not correct problem, check switch for proper operation. Replace if
		necessary.
3. Pellets will not feed.	A) The hopper is empty.	A) Refill hopper.
	B) The auger motor or control board may	B) Check to be sure that there is no blockage in the pressure tap or
	be defective. The pressure switch tap	hose. Have your Lennox Hearth Products dealer diagnose the prob-
	or hose may be blocked.	lem and clean or replace any necessary parts.
	C) Back pressure in venting tripping	C) If new installation check for excessive 90˚ bends, long horizontal
	pressure switch.	runs or excessive vertical run of 3” pipe. Possibly change to 4” pipe.
	D) Thermostat is in stand-by mode.	If older installation check for excessive ash accumulation in pipe or
		other obstructions. Clean out pipe.
	E) Thermostat wires disconnected.
		D) Check to see if thermostat is set to low or if sun is shining directly
	F) High limit thermal switch may have
		on thermostat.
	been tripped.	E) Reinstall wires.
	G) Self-aligning bearings in auger motor
	may be misaligned.	F) Allow stove to cool. Increase room air blower setting.
	H) Fines or wet fuel in auger.	G) Gently tap the auger motor.
	I) Hopper lid is open.	H) Clean out fines or wet fuel in auger and hopper. Use PFI certified
		fuel only and store bags in a dry location.
	J) Hopper lid switch is faulty.
		I)	Close Hopper Lid.
		J)	Replace hopper lid switch if determined to be faulty.